Shear waves elastography movies compresso
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The document discusses shear wave propagation in different mediums like isotropic phantoms, the liver, and brain. It shows images from ultrasound and MR elastography experiments visualizing the propagation of shear waves through these tissues at different driving frequencies, as well as the resulting elastograms estimating tissue stiffness.
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Masciotra prato 2012 compresso
The document discusses the transition from morphological imaging to physiopathological imaging. It notes that in ancient Egypt, hard masses in the body were linked to disease, and in Hippocratic medicine, palpation was an essential part of examination. It states that in the 21st century, remote palpation through elastographic imaging is becoming a reality. The document also provides examples of elasticity imaging techniques for breast lesions and lymph nodes and discusses aims of quantifying tissue elasticity and identifying disease states.
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- 1. Our mind usually considers the images ‘wonderful, but still’. We must change our vision considering images as only a fraction of a movie, like in the Shear Waves.
- 2. Shear wave propagation in homogeneous isotropic phantom. The 4Z1C/HIFU transducers are located at the top of the volume. The push is focused at 60 mm in the axial direction and at the center of the volume. The shear wave displacement amplitude and the corresponding B-mode image in 3 cross-sectional planes are shown. The coronal plane (shown in red) is orthogonal to the push axis and parallel to the direction of shear wave propagation. The shear wave travels with the same speed in all directions.
- 3. SHEAR WAVE PROPAGATION IN THE LIVER
- 4. US Elastography MR Elastography Projection of shear waves in the healthy liver driving frequency: 50 Hz actuator: remote loudspeaker with rod transducer sequence: bSSFP-MRE measure time: 16 images in two breat holds of 20 seconds Projection of shear waves in the cirrothic liver driving frequency: 50 Hz actuator: remote loudspeaker With rod transducer sequence: bSSFP-MRE measure time: 16 images in two breat holds of 20 seconds
- 5. Brain MRE (a) Shown is an axial MR magnitude image of the brain showing white matter, gray matter and cerebrospinal fluid. (b) A single wave image from MRE performed at 60 Hz. (c) The corresponding elastogram is shown and a good correlation between the magnitude image and the stiffness estimate is evident. 12 Hz 25 Hz 35 Hz 50 Hz 62 Hz